Add Two Numbers | LeetCode 2
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Odd Even Linked List | LeetCode 328
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Find the Town Judge | LeetCode 997
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Jump Game | LeetCode 55
The key to this is realizing that to get to test if you can get to a target index from the current index, you can add the current index to its value. For instance, if index 3 has the value of 5, you add 3 and 5, which gives you 8. If your target index …
Partition Equal Subset Sum | LeetCode 416
The key to understanding this problem is this. You need an array that will keep track of the possible sums you can get by adding the numbers in the nums array in various ways. For example, if the nums array is [1, 2, 3], the combination sum array will be [true, true, true, true, true, …
Longest Consecutive Sequence | LeetCode 128
AFFILIATE LINKS Great resource I use to learn algorithms.40% off Tech Interview Pro: http://techinterviewpro.com/terriblewhiteboard20% off CoderPro: http://coderpro.com/terriblewhiteboard In this problem, we add each number to a set in order to remove any duplicate values. Then, we loop over the set only. To be the most efficient, we should only check the length of the streak once for …
Longest Substring Without Repeating Characters | LeetCode 3
AFFILIATE LINKS Great resource I use to learn algorithms.40% off Tech Interview Pro: http://techinterviewpro.com/terriblewhiteboard20% off CoderPro: http://coderpro.com/terriblewhiteboard The way we’ll solve this is using the sliding window technique. For this, we need a set and two pointers. The pointers keep track of the “window”. For example, if the left pointer is at index 1 and the right …
Longest Substring Without Repeating Characters | LeetCode 3 Read More »
Trapping Rain Water | LeetCode 42
AFFILIATE LINKS Great resource I use to learn algorithms.40% off Tech Interview Pro: http://techinterviewpro.com/terriblewhiteboard20% off CoderPro: http://coderpro.com/terriblewhiteboard Here is the full implementation.
Is Subsequence | LeetCode 392
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Range Sum Query – Immutable | LeetCode 303
AFFILIATE LINKS Great resource I use to learn algorithms.40% off Tech Interview Pro: http://techinterviewpro.com/terriblewhiteboard20% off CoderPro: http://coderpro.com/terriblewhiteboard Here is the full implementation.